Create a new subscription

curl --request POST \
  --url https://api.byblend.com/api/v1/notifications \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "type": "webhook",
  "url": "https://example.com/webhook",
  "event_codes": [
    "order.created"
  ]
}'

{
  "id": "0227d1e5-ba9a-42b5-8fe2-38882aa65708",
  "created_at": "2023-11-07T05:31:56Z",
  "is_active": true,
  "type": "webhook",
  "user_id": "0227d1e5-ba9a-42b5-8fe2-38882aa65708",
  "subscriptions": [
    {
      "name": "Order Created",
      "description": "Triggered when an order is created",
      "event_code": "order.created"
    }
  ]
}